1231013443 has 4 divisors (see below), whose sum is σ = 1342923768. Its totient is φ = 1119103120.

The previous prime is 1231013437. The next prime is 1231013449. The reversal of 1231013443 is 3443101321.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1231013437) and next prime (1231013449).

It is a cyclic number.

It is not a de Polignac number, because 1231013443 - 2⁵ = 1231013411 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231013449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55955146 + ... + 55955167.

It is an arithmetic number, because the mean of its divisors is an integer number (335730942).

Almost surely, 2^1231013443 is an apocalyptic number.

1231013443 is a deficient number, since it is larger than the sum of its proper divisors (111910325).

1231013443 is a wasteful number, since it uses less digits than its factorization.

1231013443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111910324.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 1231013443 is about 35085.8011594434. The cubic root of 1231013443 is about 1071.7354557527.

Adding to 1231013443 its reverse (3443101321), we get a palindrome (4674114764).

The spelling of 1231013443 in words is "one billion, two hundred thirty-one million, thirteen thousand, four hundred forty-three".